I've got 2 AimTraks for a MAME LCD screen setup that work well. I'd buy a Sinden though, and it would reinvigorate me to buy available gun games for PC. He's smart to make it compatible with consoles, as that's where the money is.

A few years back I had a 2-player 'Alien 3 The Gun' in the garage. An enormous thing, but wow those plasma rifles with recoil were sweeeeeet. A great game :-)